Someone was suggesting earlier that the graph below showing NCDC TOBS adjustments are unwanted, might just be a coincidence.
So I did a correlation between the two data sets, and found it is excellent.
The important thing to remember is these two data sets consist of a completely different set of US stations, with different time of day observations as of July 1936, yet they show excellent correlation.
This shows us that both the NCDC TOBS adjustments and the infilling adjustments are completely unnecessary, and destructive to the US temperature record. They cool the past and create a fake warming trend.